Abstract
To reveal the impact of cadmium stress on the physiological mechanism of lettuce, simultaneous determination and correlation analyses of chlorophyll content and photosynthetic function were conducted using lettuce seedlings as the research subject. The changes in relative chlorophyll content, rapid chlorophyll fluorescence induction kinetics curve, and related chlorophyll fluorescence parameters of lettuce seedling leaves under cadmium stress were detected and analyzed. Furthermore, a model for estimating relative chlorophyll content was established. The results showed that cadmium stress at 1 mg/kg and 5 mg/kg had a promoting effect on the relative chlorophyll content, while cadmium stress at 10 mg/kg and 20 mg/kg had an inhibitory effect on the relative chlorophyll content. Moreover, with the extension of time, the inhibitory effect became more pronounced. Cadmium stress affects both the donor and acceptor sides of photosystem II in lettuce seedling leaves, damaging the electron transfer chain and reducing energy transfer in the photosynthetic system. It also inhibits water photolysis and decreases electron transfer efficiency, leading to a decline in photosynthesis. However, lettuce seedling leaves can mitigate photosystem II damage caused by cadmium stress through increased thermal dissipation. The model established based on the energy captured by a reaction center for electron transfer can effectively estimate the relative chlorophyll content of leaves. This study demonstrates that chlorophyll fluorescence techniques have great potential in elucidating the physiological mechanism of cadmium stress in lettuce, as well as in achieving synchronized determination and correlation analyses of chlorophyll content and photosynthetic function.
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Claims 10
Claim · model-written summary
Cadmium at 1 and 5 mg/kg promoted relative chlorophyll content.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- cadmium stress at 1 mg/kg and 5 mg/kge0
- Outcome
- relative chlorophyll contente0
- Direction
- promoting effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cadmium stress at 1 mg/kg and 5 mg/kg had a promoting effect on the relative chlorophyll content”
t0“Lettuce (Lactuca sativa L.)”
Claim · model-written summary
Cadmium at 10 and 20 mg/kg inhibited relative chlorophyll content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- cadmium stress at 10 mg/kg and 20 mg/kge0
- Outcome
- relative chlorophyll contente0
- Direction
- inhibitory effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cadmium stress at 10 mg/kg and 20 mg/kg had an inhibitory effect on the relative chlorophyll content”
t0“Lettuce (Lactuca sativa L.)”
Claim · model-written summary
The inhibitory effect became more pronounced over time.
- Taxon
- lettuceLactuca sativat0
- Treatment
- extension of timee0
- Outcome
- inhibitory effecte0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the extension of time, the inhibitory effect became more pronounced”
t0“Lettuce (Lactuca sativa L.)”
Claim · model-written summary
Cadmium affected both sides of photosystem II and damaged electron transfer.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- seedling leavese0
- Treatment
- Cadmium stresse0
- Outcome
- electron transfer chaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cadmium stress affects both the donor and acceptor sides of photosystem II in lettuce seedling leaves, damaging the electron transfer chain”
Claim · model-written summary
Cadmium reduced energy transfer in the photosynthetic system.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Cadmium stresse0
- Outcome
- energy transfer in the photosynthetic systeme0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cadmium stress affects both the donor and acceptor sides of photosystem II in lettuce seedling leaves, damaging the electron transfer chain and reducing energy transfer in the photosynthetic system”
Claim · model-written summary
Cadmium inhibited water photolysis.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Cadmiumt0
- Outcome
- water photolysise0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also inhibits water photolysis and decreases electron transfer efficiency, leading to a decline in photosynthesis.”
t0“Lettuce (Lactuca sativa L.) to Cadmium Stress”
Claim · model-written summary
Cadmium decreased electron transfer efficiency.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Cadmiumt0
- Outcome
- electron transfer efficiencye0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also inhibits water photolysis and decreases electron transfer efficiency, leading to a decline in photosynthesis.”
t0“Lettuce (Lactuca sativa L.) to Cadmium Stress”
Claim · model-written summary
Cadmium led to a decline in photosynthesis.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Cadmiumt0
- Outcome
- photosynthesise0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also inhibits water photolysis and decreases electron transfer efficiency, leading to a decline in photosynthesis.”
t0“Lettuce (Lactuca sativa L.) to Cadmium Stress”
Claim · model-written summary
Increased thermal dissipation mitigated cadmium damage to photosystem II.
- Taxon
- lettuceLactuca sativae0
- Treatment
- cadmium stresse0
- Outcome
- photosystem II damagee0
- Qualifier
- increased thermal dissipatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce seedling leaves can mitigate photosystem II damage caused by cadmium stress through increased thermal dissipation”
Claim · model-written summary
The reaction-center energy model effectively estimated relative chlorophyll content.
- Taxon
- lettuceLactuca sativat0
- Outcome
- relative chlorophyll contente0
- Value
- effectivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model established based on the energy captured by a reaction center for electron transfer can effectively estimate the relative chlorophyll content of leaves.”
t0“Lettuce (Lactuca sativa L.)”
The same questions in other papers
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- positive
- negative
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3 papers in the same direction as this paper
- negative
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heavy metal · physiology: pigments · Lactuca sativa (garden lettuce)Positive and negative results
2 in the opposite direction
- negative
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heavy metal · physiology: photosynthesis · Lactuca sativa (garden lettuce)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.